| 摘要 |
PURPOSE:To improve the response of controlled variable being an output of a controlled system at all operating points by switching the gain of a PI controller in accordance with the variation of an operation of the controlled system. CONSTITUTION:A controlled variable being the output of a controlled system 1 is detected by a detector 2, and a deviation signal e(t) of a difference of its output signal and the output of a reference generator 3 is inputted to a controller 4. A gain switching device 5 inputs an output signal of a detector 6 for detecting a manipulated variable y(t) being an input of the controlled system, an output signal of a detector 7 for detecting a state quantity of the controlled system, and an output signal of the controlled variable detector 2, and estimates a coefficient of a transfer function for expressing the controlled system. By this coefficient, an operating state of the controlled system is estimated, and in accordance with its coefficient, a gain switching signal is outputted. By this signal, one gain is selected from a memory 42 and proportional and integral gains of a PI controller 41 are changed.
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